And now, a startling look at the last days of superstar, michael jackson. And the e-mails just emerged revealing that promoters of his concert were deeply concerned about jackson's mental state. Abc's nick watt has the story. Reporter: London, march 5th, 2009. And the king of pop is announcing his stunning comeback. This is it. This is it. Reporter: But just hours before that press conference, randy phillips, president of aeg live, allegedly e-mailed company bosses back in l.A. M.J. Is locked in his room, drunk and despondent, wrote phillips. Are you kidding me, came the reply. He's an emotionally mess. Riddled with self-loathing and doubt now that it's showtime. This is among 250 pages of e-mails obtained by "the los angeles times." And the michael jackson described in them is a jackson the public never saw. ♪ Some things in life they just don't want to see ♪ Reporter: Not even in "this is it," the behind-the-scenes movie, documented by the press before his comeback. But this slurred message, a month before his death, played at conrad murray's trial, seems to support assertion jackson was not well. The underwriter of the comeback shows is now suing aeg, claiming the company lied about jackson's health to secure a $17.5illion insurance policy. Jackson's heirs are also suing aeg, claiming promoters pressured him to perform. Publicly, aeg claimed jackson was in great health. But in private, by mid-june, there are strong signs of paranoia, wrote the show's director. We could have a real problem here, wrote randy phillips. We could not reach aeg for comment. But lawyers for the company told "the times" these are incomplete and leaked to portray the company in a negative light. For "good morning america," nick watt, los angeles. Thank you, nick.

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